CAJ | 학술논문

从川东邻水和渠县采集的73个下-中三叠统锶同位素样品获得了对应于地层累计厚度的锶同位素演化曲线.与C.Korte等利用特提斯和中欧地区219个锶同位素数据及古生物学研究所得出的对应于地质年龄值的上二叠统-三叠系锶同位素曲线对比,将川东下-中三叠统剖面进行了年代地层的划分对比.根据剖面中获得的牙形石化石,讨论了对四川地区三叠系底界的确定,认为应尽可能采用综合的地层学方法对沉积地层进行年代地层划分对比.
종천동린수화거현채집적73개하-중삼첩통송동위소양품획득료대응우지층루계후도적송동위소연화곡선.여C.Korte등이용특제사화중구지구219개송동위소수거급고생물학연구소득출적대응우지질년령치적상이첩통-삼첩계송동위소곡선대비,장천동하-중삼첩통부면진행료년대지층적화분대비.근거부면중획득적아형석화석,토론료대사천지구삼첩계저계적학정,인위응진가능채용종합적지층학방법대침적지층진행년대지층화분대비.
Strontium isotope stratigraphy is a new method to divide and contrast strata. This paper sets up an evolution curve of the strontium isotopic composition corresponding to the accumulative thickness based on 73 unaltered marine carbonate samples collected from Linshui and Quxian of East Sichuan. It is correlated with a curve corresponding to geologic time set up by C.Korte et al in the Upper Permian-Middle Triassic. The curve is based on 219 unaltered marine carbonate samples collected from the Asian Tethys and middle Europe and on the study of paleontology. And the section of Middle-Upper Triassic in East Sichuan is dated. The base of Triassic in Sichuan is discussed and defined according to the conodonts collected from some sections, and synthetical methods should be used in the chronostratigraphic division.